Can I seed on torrents I have not downloaded but have the files to?

Thing is, I have the batman series from the 60s that I downloaded a long time ago. I deleted the torrent but I want to seed again because I remember it having like 1 or 2 people seeding and I have better internet nowadays, I have two questions on this:

Is there a way to find the torrent directly from metadata on the files or some other way instead of having to search on sites until I find it?
If I were to find a different upload of the same files, can I just verify the files I have and start uploading directly without having to download them first?

3 comments

If you find a torrent with the exact same files, yes you can seed without downloading first. What I do it's to start the new torrent so it create the files. Pause the torrent. Overwrite the created files with the files I already have. Then verify the torrent. And finally resume it to seed.

2
- Yeah basically just make your torrent client think it downloaded them already.
  
  2
You can try creating a torrent with the file(s) you have at hand and try to search with the info hash. You need to be sure the metadata (e.g. name, size, directory stucture, etc.) of the file(s) in question is identical to the original download.

You can try adding the torrent into a client. Pause it and then copy the file(s) to the download destination. Rename the file(s) accordingly. Ask your client to recheck/rehash the file(s). If the file(s) is/are identical, it will work.
1